SSL certificates are not yet verified

[pagekite]

When connecting with HTTPS, the SSL certs are not yet verified, making the whole thing insecure.

[pagekite]

Further details on this. In order to fix this issue, libpagekite needs to support the following:

- Discovery & use of OS certificate authority stores.
- Support for a TOFU model of some sort.
- Specification of acceptable certificate details (fingerprints, names) via. API methods.

Whether we use TOFU or the standard SSL PKI (CA certs) model is an unanswered question at this point; PKI is the standard but it has some nasty failure modes.

This is a particularly sensitive part of the app, because if we refuse connections because a certificate doesn't validate, there is a risk of false positives taking customer devices offline. So although security is important, we don't want to make things less reliable.

[BjarniRunar]

Progress was made in b8fba94, f5f2670, 3e06b51, 6d80418 ... but we're not there yet.